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P-Toluenesulfonyl isocyanate PTSI CAS 4083-64-1 is clear, colorless liquid, insoluble in water. P-Toluenesulfonyl isocyanate (PTSI) can be used as solvent, and filler, pigments such as dehydrating agent and effectively applied to the wet curing one-component and conventional two-component polyurethane coating system.